Research/Sitter/MAGNDATA / 0.432_KMnF3.mcif

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Spin lattice of K1Mn1F3Spin lattice of K1Mn1F3

K1Mn1F3

MAGNDATA entry 0.432 · source
d-wave altermagnet
No net magnetisation, yet the electron bands are spin-split: the up and down spin sublattices are related only by a rotation or mirror, never by a shift or inversion. d-wave: the splitting changes sign twice around the Fermi surface (2 nodal planes).
Spin group ¹m²m²m: each symmetry marked ¹ keeps every spin, ² swaps up and down.
ordered ≤ 77 K (−196 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.
Structure · 11 properties
Magnetic groupP n′ m a′ BNS 62.448
Point groupm′m′m
Parent space groupP n m a No. 62
Spinscollinear · 2 nodal planes · net moment 0 μB per cell
Propagation[0 0 0] 1k
Cella 5.88848 · b 8.34826 · c 5.90193 Å · α 90° · β 90° · γ 90°
Transition77 K (−196 °C)
Measured at10 K
Magnetic ionsMn
Largest moment component4.8 μB
MethodThe old entry from 15/10/2020 has been corrected after a communication of Chang Liu

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in P n′ m a′ →
Atom sites · 4 sites · CSV
siteelementxyzmambmc|m| (μB)
K1K0.51240.250.0052
Mn1Mn000004.84.8
F1F−0.00260.25−0.0381
F2F0.27260.0180.2278

Moment components are along the crystal axes a, b, c (μB), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

K.S. Knight et al. Journal of Alloys and Compounds (2020) · doi:10.1016/j.jallcom.2020.155935

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.432_KMnF3.mcif from MAGNDATA · entry page

sha256 of this copy: 5c3c5a7f8ce5c73f4697b2b592dbb6ca8f34289cc7e8c721be7e8b23c676b7ba
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.432_KMnF3.mcif.